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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af91dfe597c198eef43d4e1f5ae6ba4e7660ef24e1f6c95ef1767a5378c4f88b' 
  AND token = 'AspPptuD8LebwpJ5HzvAhsyg/fMVKtNaq0JyO6s5GFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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