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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392704ec3efb2271ed3b50e5705980bcd0ff959f580efefd8b34066fcacad544' 
  AND token = '35r0evxkBj/LGRG0ttTZEH9lOIrw/K5pBWDCwsx4JHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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