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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7638bca11a8ce8813e2c9bcf9e008879d6929a5c415f6dc2e6b63173f68a6460' 
  AND token = 'Euk4nSTqz/jm36N+zarYTI/eod1oObh9GM7jqRaaf84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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