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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6328a10e37e4e9ee32747a8f53096ef1f7c96cc19e7ae8c892d2f530a0d123' 
  AND token = 't7L/Htt71Lck9AlpjlZOGq/LMET80PtyIHyKj8ygeFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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