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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa67d6e6eaf0edfa3d38d2c7638a43646cf88e54d4e9c98f153154c27d15b14' 
  AND token = 'WOAManNCzlyiFLYJKxQ6afZh5zCvXiivTlp1BvDfQzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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