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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bd6d8ac27e945dd965b94669fb247fc1bdb5cba09c3d67ab181599cc135755' 
  AND token = 'bd8wHohJ0F5e3D1QPCnWZ02R7FPvlOH9u9bHnxKjp7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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