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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4b43b114c79c96d5a8afa1e40e8b85055dacc117e37bc18479c3d3908295c4' 
  AND token = 'xX3LPZAPDLLgMostb7vEXN7XEgVa1V8CFizWRGs7Hlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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