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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b1472a1504eebfbf6453a76ade3926b9b9c1336243f9c2d15b4660f2951631' 
  AND token = 'rWY3Nnov27wVj+w39/e8k303VjiGOALA6qCAXn9dQ4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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