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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2bd112dbd17b5fc93e04b8c6973d03c740cccc7bffaf2781dfbf07ff2d8ca9' 
  AND token = 'IDSipTpntXdg8wyvHopk38Qu83xophlfOH9yKxA9tK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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