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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dd8f01d620c6a27550edd073abf29664ff542f75ded64726a7e6fd083398b6' 
  AND token = '4w1AsBre+ErFCkQX++3wGpgP0aJj3bGD6a9T0xG3Iwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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