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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c7774cd9b41e7db216d05022a8b93c8abff825d76350cbbe1d72af091759f4' 
  AND token = '/5m2kiPo1aYIYYwr6C5MQSp94nXcZ21OLtdvjTq9moY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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