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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af5ec41b651251f2b3aa7237ce28fad6b079b03927a0cee56c3e8429b893f29' 
  AND token = 'hxyvENgB0sGNVZIgrOrl51epA4ngNAIucu1qUY2atEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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