SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592c46b24e9230708fa83b658657b22b7bb07d176e81e0a58ab2dd91133f6d23' 
  AND token = 'r6Yr7+HzuKowGhtimVtbXrL0jEMv7hU3FQ1VADhAZG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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