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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90eb4b6774dfee915d9d3688db9942d7d0d4e67e255c924a6adbfc3662c2ba97' 
  AND token = 'duzPWHGDn8SzwZZ7KDw7wc2eRDAVHqIkbJuG5/6gnwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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