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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42884c6cfc1ab039a99b159220754640a799c0ee76a5f7702c0ff50928ab98a5' 
  AND token = '0XRv6cSRAIH2kVhjcQoUi+eNcTuz6TQnhJi2Ux67tWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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