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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28539d5c9c0506387a708a513448a0ba47bfd5247ebb864cf6aca320cd4d1823' 
  AND token = 'jkjRPdHHEzf9QcgPVxQu5IJgU6z0I+9NrVJXlOyn++k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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