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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100a6a082b3653facef387c5bca7488c533e10560016f27024e3cbf54d6821d7' 
  AND token = 'KA0aDXcxxxzH5RtVxfyZH8KTGR3ayKQzO/85d0i3rWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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