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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c86fb79fbf877980a73ac7031dd1416b19fb081d10eb65b36c5a9e7e5dd004' 
  AND token = '3yUwFaHb/p8MVcXpp8InY+DwC9D60jb8mzy/sEcldBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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