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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7279b867ce3c14030026ed45b4e5844708e8d9388aa2210b79937067ed79d7' 
  AND token = 'ALfdTsNTr6nNZUczdo1XUXMbw18GocQ2UZ+7prji2A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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