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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b740bdd75ae0f0f882d2c1c00b223c38fc686569ad908a5bce9a514f8d8ec67' 
  AND token = '+kAAz2J2mWSSMvlF2EFiKIe6FYnuuxrzAudKAxdZqGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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