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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f63dbd5c816f6f8bb631c02ab39d3beb410b19b1af9b8639109e5e99eb8cd9' 
  AND token = 'gBh3fAmS9pjU0qiPlUVjcyNiIX8rWEi6pHB6OyRl3sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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