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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53368abf489f2967285670d86c8f6e1020200e35889ad0e7cba8ba821bf6dd1' 
  AND token = 'wbk9AC40eZ/xKP8KCSoIS3IZBHs6glbOTnNnkzhngts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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