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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c7e3d6a61091f41db1238a6d4f1bc73a8caa63bac200fa1ec612c49e6df62a' 
  AND token = 'Ax9/jWqmDqvpLy6K5SxfHpghi4CrUAEAblxnwi5RwrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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