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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16305effecc0ed2b9d3629741b55af93c0754ef38135b43c6c8ca8cc284476fd' 
  AND token = 'n17SsLOXYIy/A5ptUuHzZlYO91y7DueicIV+FzQ+We8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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