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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28ce7a1930de4953fb9e094a333aed73a62c83901475b76f1ef9f2038c5b663' 
  AND token = 'Kr1hexZRbrLKfdfnHmDh5Zbnvl4bePbPd4nxYgizOjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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