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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92117c6ec75776dec60a666d747c1111200cff0ff2c4bd6bdac3584d50fa6e3' 
  AND token = 'fhtwZa3+O+E6eoA5H1epdVzQMYpZXB7gXsibo7PhKTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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