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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a862d8e7348c27f8122aea6144858933aeef1c5ebe25d4e905ac3e7fccd8ca7a' 
  AND token = 'BFIvR9w6jd965WxsU8x30m0Oqc9KAiIoGB84Hb0mhxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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