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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbc9b874ede229cf5820cae94827eb6af26cf5e14fd67fec79d1cbb3e86ac39' 
  AND token = 'keCihR+P0XdCJ2P9dKUotmWlMDQmY7GVCSVaRaUda5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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