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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085e6b5a8fcd9eb6d0e4c3563b6cfb6ef86b79be396961f04b52042c5fdfbe6c' 
  AND token = 'yktmEvQJ1MLd8PP+efahox1siM05cmebHt6Nby7+228=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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