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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c72d9d83fa1cbb0783f678f1ea34a2e3fdd096de4ac5458f3f1c402109e0bb4' 
  AND token = 'Eo4mi47jnY2Dl0+YMIni0pMsTOaRtE8QjpX8LX5togM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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