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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055c9b3401c9500ab542dafc5a66203868bfb742ff420a461118e0ef44ff28d8' 
  AND token = '8uo+FS7KXVye8QsquxswDNZHrLg/0i7dBJ8NUZQLAuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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