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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ce713e8c2c5a92708b36e4d91435f450f352bd8c00cd085605956fd14f56de' 
  AND token = '6Qd9vpN92sfldyv3/A2YATYh/jYLQ/Az9G2mkK5WWzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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