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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f28fce0415fabf1d669a959cc6e24415abb5e77eb090f6b910e7fa6d7d12794' 
  AND token = 'Puy3L2XxYkMRAd9W5wK3YmE8i3lagpDwcox2ivxJeEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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