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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3137ec2b616287ba9f8504787e238cff3225abea1725af9c1590316ecdcd342' 
  AND token = 'KG+bTsRmD1G6KYRkUi/elX8C1dtqY4u0Tm/+OSNxDOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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