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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d670f1d90cae077daefed2f26d5527fd773a4b32a611ef27d5d91d5a20a8e6f' 
  AND token = '/j6gvP28VE4aL40tA8jlPLiHD/hPlJwGlJub7urhw58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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