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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bbb19078c846083d3c29a073f625b2d5c4d7ecfaf83151c45e04c1d5982cf7' 
  AND token = '1y9b30VJ1+jHhJO1iE5Q46tQOz9Xt6SsQG5UJZUqVSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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