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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135e994f4a132fe14b4ba5999f20771c2706e7e845337ad0a10cef9d3811cdea' 
  AND token = 'gzZK9vDeuPFZK+F71xaCBF9DYKuYx0dTEDBGmblm0ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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