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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756575fd88dcd6ad7f57f0e9a6842603bf757d7d2324308a74f29ed416fe5218' 
  AND token = 'kgFgsJAeYyJGmX3uvCpsI4MqTUFm1b5UL77Sm5OUgio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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