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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78da59255667e9e54cb6b3ca346548895444ad16ece9e275de98195a132cfefa' 
  AND token = 'FHFMMW3eGsFV8oBbriqOoEv9CCvO1aap1qs51q+jO6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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