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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965991a34225044cb9f7d70fab6cc5bcc6ff0e7d44a6f579aedb78fa6e6b6de4' 
  AND token = 'BlsZuJURTbb2tUX5CgXW2ck3okSdaRtLh/fYdBkCcd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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