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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c8e989af77a83f54239692b8d8b5a598a65f8ad96be663e527d396f94ec162' 
  AND token = 'ASiAhOdaN6Vfdobt6XVlFMFy2XX1jo4aw4J78J6dDgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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