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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfee68323d8dbb78db2a71346c3fd56a0a7c5c3eb438af8be45f00f710edb12' 
  AND token = 'VsEN3kfPeO2aVYj2zDVpgBXDmhKPKO9x3r2gPaPRyqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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