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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56de30fa245f9eb2ff17a0b3038e5e5ff56395a8e0e5e8a0bea1644892fe03cd' 
  AND token = 'EaOfwFdORWvKbNKgWnx/APu9B/DG7O+QblP6MNdUSmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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