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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f1db390af4c6401082f04c6fb35efd9f0ad2f22b0493fe7a9d04e33b286958' 
  AND token = '1QWa8TWqSAzwWHQkCwhf0x94Qt7m+tRY+g6iImjWK40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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