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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee0cec955864a7b8e9937a4966ce740455bfabb50b21fc3c7ca44fa01ab1f0c' 
  AND token = 'TX9ZPfXi5n164lA6ZgmbqlylafrdFz0iZjUG4iBZd5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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