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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f753872bf67e99be21b9bf5058462e0dcdef163adfce333ed34201df0f7ac8f0' 
  AND token = '0bKk28V67Y+NFMILcjZK2bu9eDkFuAE3cGGbmSTrChI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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