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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47ae16c3f19caf025be598bc4d9d378124019d20a333b714b24a40991656f94' 
  AND token = 'ioRaJoig8DeUeVP2jUIwgr8yk3ZTGRbHIEd869MdPFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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