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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b86b37115b7e6c3b1e3d8aa58837471b05e28c875b3abd2347b06f0cbb92546' 
  AND token = '+UXH7mQMnjHvxGDiJ9tidayb0wmbnIqTeK1g4yU0oLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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