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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e9e0413886bece455957cfbd50d67c9fa1ea73789159311ced1dec4fc9607c' 
  AND token = '/HuwpxXGLt8ZfEO+ygKDOih/qySasC8Hd6g+urCj8HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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