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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40e0f0c4d8aae53ca01338d0f3a371195748ff3d0d8bc3b74f9db8772307758' 
  AND token = 'ZsTa6oTKDuvr+DJtzgzGmLKDO+f0ZCuVkPxkOdMHNCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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