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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c1db8dcc3357e2d575587dd98cf9d077b6a205eca92a1011907e14b76c4201' 
  AND token = '19F0mkUi+HKlXQ3ysD5qjTGqO6odU0YjSuAk6MATiZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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