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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2987ebe455049e674a152546f194f1d087e3d8de4abeab5c9e7be676881bc9a5' 
  AND token = 'l8WhbHdZsi4LXAXOupR+r8IWBiv/9lokLJqDDJhxWUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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