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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6739f30d20c4b5e1756dbe5d9007513458a484c826f3427b78a9d75cc930ae4a' 
  AND token = 'yzyS0/YpHkdVuroPlKkQgllG6eynknP7qXVIsmmoNrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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