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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1c78125df9d50e3f27713347f2b4a7d5ea441a2d040a10d34892d50925c45f' 
  AND token = 'FEzfcM6IzVCmRQILz3wg7HDkvswQVz5ETJJBcS60AG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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