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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da74334b476ac1d47dbfa79cea83611bd546fad63609e072d24d6ac3db44928' 
  AND token = 'shsqhol0d9jvXX83PBndTbdifEE14hvpYPezM6p55+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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