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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57de53fd8687e955e1398f1a49965cf2a55a75b07f3d1e04780ee652ef3f9bf4' 
  AND token = 'X76YY+p2Ag9SBiB5FilHyWJpzzugYCNCS4340tR5ks0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}