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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc0333fa7c12686dc5841d0de70df67de492118983523d84248a550c211855d' 
  AND token = '3TMjs2yj9Vpzao4rMZ84qG9OYHKw5mpo7hW79oBg7CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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