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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8794aa727b71039eb97ed457202fb4f1e709afa43cbaf3bec34d1b3944a16ccc' 
  AND token = 'yhOJPiBsKooc2MzUQ6sEuXqJbfkXla/QgL7LH37cagw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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