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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8b8ca79ad8e1e2206b35552c89c700bbb6c4c2419054d5ffd0dd45717a3585' 
  AND token = 'B5VM0XFD+M+YB118NPxemIwpqJjpXPbtbSfVFpgP3JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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