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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5bad89af484cdc45f3b8522e83d7e347006418de1be10c9d3ef1ccd0c2fdb4' 
  AND token = 'ln82W5ao0vc+ILaDc+xrHYaAlAPotuVtmpCTwTC3Yq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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