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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd9e18ad86e9d9783e3ea57a02e48b72b3273b4dec02e3ccfc818dbe0e15654' 
  AND token = 'x3hBEJDTd5bxptArR3VKGdl4KYw2R/c7f6vvQxmGdZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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