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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbd9224bea21b67885eef989c088935e00166620396458aeabb8662cd67aa83' 
  AND token = 'b/gyrSW0lgw/8XEOgQYOwLmhA64RUXuEE407fi0itwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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