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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd54777ad0cb0e9ee27284a5f1b3db9d362b24df1168a6dd3cc7e0100533ab51' 
  AND token = '+4hRXS9K9a9aFL2cACpC7QbLz8YI6BFJB42jBT4NWWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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