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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05eaec70bb64a2eabaeb802a8fe11fd0c3e91bede6bc41745ab2bd9d1ab33ad9' 
  AND token = 'zh/E3Tb5x+/kjCr6Ig9QS03rhXFUEH+4883oMU0PsGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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