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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9decd63848e1b6f5a611d9d62064e89d7fb39e7d011a7492b927c826e47408cd' 
  AND token = 'MXCE3YXugyVL+gmxOI47uCxBT6/tQuOrLGJAo7xGAnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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