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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516c82b36afb6e6ddf3624acf965d7c032d1468512c42c7dea0c4a05ca9b6725' 
  AND token = 'NM/7kKMbO/5rAtWVV2NCQq69isoRYOzGqbpJazXmBDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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