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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd0db38e9b2124d9be2bce70779128ffa22b4d88940c31268b8f7d852c98104' 
  AND token = 'HZuY1YtJI5RFX7RxIBb+9UQ2RB6WQ+8N6VLEordAcxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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