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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4f4bc7f67837ed29653380a574e4f734c1f62775d76cdc6543e3c583f00350' 
  AND token = 'UM8Foww7JZ0f8USoZ/iFKqEErGTLTLkeNoUQre94/cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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