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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64eb4ee59dc2c8ffde078e176460ffae8cf5d8301872d1fadaae260ed8c41a1' 
  AND token = 'Pq1L+7+Nw2wHaPufXlM7LSwn60HEyQ+0hBsivrkZY2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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